of canton



H. C. DRUIVHVI.

BOTTOM BOARD FOR FOUNDRY FLASKS.

APPLICATION FILED MAY 3 1919.

Patented Nov; 18, 1919.

INVENTOR.

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r-"L C. JDRUMM, F CANTON, OHIQ, ,ASSIGNUR T0 THE UNION MET MANUFAU il UEINGr QUMJPANY, 0F CANTON, OHIO, ft GQRIORATION QF @HlIUt neuron no ron rounn Ill 9 l I The invention relates to improvements.

in bottom boards for foundry flasks and has for its objects the production of a bottom board formed of sheet metal and provided with integral strengthening ribs producinga bottom board which is light and strong; and to generally improve and simplify the construction of bottom boards for foundry flasks.

With these objects in view the invention consists in the novel construction and arrangement' of parts, hereinafter described,

illustrated in the accompanying drawingsf" and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of construction may be made within the scope of the appended claims, without departing from the spirit or sacrithe advantages of the inven-.

ficing any of tion.

'lhe invention thus set forth in general terms is illustrated in the accompanying drawings forming part hereof, in which- Figure l is a perspective view of a bottom board. constructed in accordance with the invention, showing the upper face of the board.

Fig. 2 is a perspective view of the under face of the board;

' lFig. 3 is a section on the line 33,'Fig. 2.

A practical embodiment of the invention is disclosedin the accompanying-drawings, forming a part ofthis specification in which similar numerals of reference indicate corresponding parts throughout the several views.

The usual method of making bottom boards for foundry flasks has been to build them out of wood, but owing to the-excessive heat and burning gases to which they are subjected, in their use, they are easily dbstroyed by burning and warping and aldid though attempts have been made to make bottom boards of metal, in order to produce a bottom board which will stand the wear and heat to which they. are subjected without warping; the bottom boards thus far pro- Specification of Letters Patent.

Application filed May 3, rare. serial No. Wit-tiff.

duoed of metal have been so heavy and unwleldy that they have not been practical.

The bottom board to which this applica till tion pertains is so constructed that it combines lightness with durability being formed of sheet metal provided with spaced downwardly stamped integral ribs, the top face of the board presenting a substantially flat surface which .is necessary for the use to which the board is put. lit is well understood that bottom boards must be rigid in order to prevent any springing and owing to the fact that they are handled considerably *it is of importance that they be light in weight. a

r. The bottom board is formed of a metal sheet jliprovided with spaced longitudinal, downwardlypressed ribs 2 for the purpose of giving rigidity to the board and preventing long tudinal warping or springing thereof. The longitudinal edges of the board are turned under forming strengtheningbeads '3 which further tend to strengthen and reinforce the board longitudinally.

Reinforcing bars 4, preferably formed of sheet metal and provided with downwardly disposed ribs 5 are located transversely across the under surface of the board near the ends thereof; being attached to the ribs 2 of the board by means of rivets 6 or their 3 equivalents. These reinforcing bars prevent transverse buckling or warping of the bottom board.

For the purpose of raising the board from the floor and making it easier to handle the same, and allowing room to attach the usual clamps which are used to clamp the mold sections to the bottom board the board is provided with feet 7.

The depressed ribs 2 not only reinforce the bottom board but also act as escapement channels to allow the gases formed by the cores to escape thus preventing accidents and damage to the casting as it is not unusual for cores to explode where thesegases cannot escape. It should be noted that smular ribs may be also provided transversely of the bottom board intersecting the longitudinal ribs.

The reinforced edges produced by the forming of the heads 8 provide suitable attaching means for the usual clamps. Apertures ll are provided at intervals in the body of the bottom board t6 further allow escapement of the gases formed from the cores. Feet 7 are provided near the corners of the board, each of these feet comprising a sheet metal strip bent into channel form and provided at its upper edges with the out-turned flanges 8 by means of which it is connected to the body of the bottom board by rivets 9 or their equivalents. Notches 10 are formed in the upper edges of the feet 7 to accommodate the adjacent rib2 of the bottom board. This construction further strengthens the structure, making the attachment of the feet to the bottom board more rigid as the bars 4 are located within the channels of the feet.

Although the drawings and above specification disclose the best mode in which I have contemplated embodying my invention I desire to be not limited to the details of such disclosure, for in the further practical application of my invention, many changes 1n form and construction may be made, as circumstances require or experience suggests without departing from the spirit of the inprising a metal sheet provided with spaced,

vention, wlthin the scope of the appended claims. Y

I claim- 1. A bottom board for foundry flasks comprising a metal sheet provided with spaced downwardly pressed longitudinal ribs and transversely disposed reinforcingmeans upon its under surface. 2. A bottom board for foundry flasks comprising a. metal sheet provided with spaced downwardly pressed intervening flat portions and angularly disposed reinforcing bars attached to its under surface.

3. A bottom board for foundry flasks comdownwardly pressed ribs and intervening flat portions and reinforcing bars located at right angles to the ribs and connected tothe under surfaces of the 4. .A bottom board for foundry flasks co'mflat portions, angularly disposed reinforcing means upon its under surface andbeads formed upon its edges.

5. A bottom board for foundry flasks com a metal sheet provided with spaced,-

downwardly pressed longitudinal ribs and transversely disposed relnforcing bars attached to its under surface.

6. A bottom board for foundry flasks comprising a metal sheet provided with spaced, longitudinal, downwardly pressed ribs and transversely disposed bars connected to said ribs.

7. A bottom board for foundry flasks comprising a metal sheet provided with spaced, longitudinal, downwardly pressed ribs and intervening flat portions.

8. A bottom board for foundry flasks comprising a metal sheet provided with spaced, longitudinal, downwardly pressed ribs and intervening flat portions and integral beads formed upon the edges of the sheet.

9. A bottom board for foundry flasks comprising a metal sheet including, aced, longitudinal, downwardly pressed r1 s and intervening flat portions, transversely disposed reinforcing bars connected to saidribs and "comprising a. metal sheet provided with spaced downwardly pressed longitudinal ribs and transversely disposed reinforcing means.

11. A bottom board for foundry flasks comprising ametal sheet provided "with spaced downwardly pressed ribs and intervening flat portions of greater width than the ribs. v

12. A bottom board for foundry flasks comprising. a metal sheet provided with spaced downwardly pressed ribs and interve flat portions and reinforcing means upon its under surface.

13. A bottom board for foundry flasks comprising a metal sheet provided with spaced downwardly pressed ribs and interprising a metal sheet provided with spaced, downwardly pressed ribs and intervening v flat portions of greater width than the ribs and reinforcing means upon its under surface.

In testimony that I claim the above, I have hereunto subscribed my name.

HERBERT C. DRUMM. 

